java.lang.ClassCastException in sonar-maven-plugin:3.9.1.2184

[ERROR] Unable to run check class org.sonar.java.checks.RedundantTypeCastCheck - S1905 on file 'src/main/java/de/chamaeleon/ionas4/project/objecttype/BusinessObjectHelper.java', To help improve the SonarSource Java Analyzer, please report this problem to SonarSource: see https://community.sonarsource.com/
java.lang.ClassCastException: class org.sonar.java.model.Symbols$UnknownSymbol cannot be cast to class org.sonar.plugins.java.api.semantic.Symbol$MethodSymbol (org.sonar.java.model.Symbols$UnknownSymbol and org.sonar.plugins.java.api.semantic.Symbol$MethodSymbol are in unnamed module of loader org.sonar.classloader.ClassRealm @46b6701e)
        at org.sonar.java.checks.RedundantTypeCastCheck.isMandatoryMethodReferenceCast(RedundantTypeCastCheck.java:184)
        at org.sonar.java.checks.RedundantTypeCastCheck.isUnnecessarySubtypeCast(RedundantTypeCastCheck.java:175)
        at org.sonar.java.checks.RedundantTypeCastCheck.visitNode(RedundantTypeCastCheck.java:65)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.lambda$visit$6(VisitorsBridge.java:287)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.lambda$forEach$9(VisitorsBridge.java:303)
        at org.sonar.java.model.VisitorsBridge.runScanner(VisitorsBridge.java:159)
        at org.sonar.java.model.VisitorsBridge.access$100(VisitorsBridge.java:62)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.forEach(VisitorsBridge.java:303)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:289)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visitChildren(VisitorsBridge.java:273)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.visit(VisitorsBridge.java:293)
        at org.sonar.java.model.VisitorsBridge$IssuableSubsciptionVisitorsRunner.run(VisitorsBridge.java:264)
        at org.sonar.java.model.VisitorsBridge.visitFile(VisitorsBridge.java:139)
        at org.sonar.java.ast.JavaAstScanner.simpleScan(JavaAstScanner.java:127)
        at org.sonar.java.ast.JavaAstScanner.scan(JavaAstScanner.java:79)
        at org.sonar.java.JavaSquid.scanSources(JavaSquid.java:130)
        at org.sonar.java.JavaSquid.scan(JavaSquid.java:116)
        at org.sonar.plugins.java.JavaSquidSensor.execute(JavaSquidSensor.java:105)
        at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48)
        at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85)
        at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59)
        at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77)
        at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59)
        at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82)
        at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:392)
        at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:388)
        at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:357)
        at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:150)
        at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:72)
        at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:66)
        at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
        at com.sun.proxy.$Proxy24.execute(Unknown Source)
        at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:189)
        at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:138)
        at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute(ScannerBootstrapper.java:65)
        at org.sonarsource.scanner.maven.SonarQubeMojo.execute(SonarQubeMojo.java:108)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
        at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:370)
        at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:351)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:215)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:171)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:163)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:294)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:960)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:293)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:196)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)

Hey there.

What version of SonarQube are you using?